Etymology
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ante meridiem

"of morning, before mid-day," 1560s, Latin, literally "before noon," from ante "before" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + accusative of meridies "midday, noon" (see meridian). Adjective antemeridian is attested from 1650s.

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Definitions of ante meridiem
1
ante meridiem (adv.)
before noon;
Synonyms: A.M.
2
ante meridiem (adj.)
before noon;
Synonyms: A.M.
From wordnet.princeton.edu